MICROSCOPIC QUASI-PARTICLE-PHONON DESCRIPTION OF ODD-MASS XE127-133 ISOTOPES AND THEIR BETA-DECAY

Quasiparticle-phonon equations of motion are solved starting from a mi croscopic realistic many-body Hamiltonian. In this microscopic quasipa rticle-phonon model (MQPM) the relevant part of the three-quasiparticl e Hilbert space may possibly be taken into account even in calculation s using large single-particle bases. As an example, the MQPM is applie d to the calculation of energy levels and Fermi and Gamow-Teller beta- decay transition amplitudes for transitions between odd-mass Xe127-133 , I127-133, and Cs127-133 isotopes. Considering the fully microscopic nature of the MQPM, comparison of its results and data indicates a rat her satisfactory agreement between theory and experiment.